WO2020105291A1

WO2020105291A1 - Enlarged-diameter hole section cutting device

Info

Publication number: WO2020105291A1
Application number: PCT/JP2019/039096
Authority: WO
Inventors: 宮永　昌明
Original assignee: 株式会社ミヤナガ
Priority date: 2018-11-19
Filing date: 2019-10-03
Publication date: 2020-05-28
Also published as: KR20210092242A; JP2020082418A; JP7188744B2; CN112955293A; AU2019382346A1; CN112955293B; US20220016721A1; EP3885092A1; EP3885092A4

Abstract

This enlarged-diameter hole section cutting device (10) is for cutting an enlarged-diameter hole section in a hole formed in a workpiece, the enlarged-diameter hole section cutting device (10) being provided with: a rod-like member (40) having a shaft section (41) and a guide body (42) which is provided with a tip surface (44) on the reverse side from the shaft section (41) and an inclination surface (45) inclined from the shaft section (41) side toward the tip surface (44) side in a direction away from the center axis of the shaft section (41); and a cutter blade (30) having a cutting section (32) which is provided with a cutting edge section (35) on the tip thereof and can slide along the inclination surface (45), wherein the rod-like member (40) further has a suction passage (80) including a flow path (81) having a suction port (81a) open in the tip surface (44).

Description

Expansion hole cutting device

The present invention relates to a diameter expansion hole cutting device.

As a conventional expansion hole forming device, the expansion hole forming device of the anchor bolt planting hole of Patent Document 1 is known. In this diameter expansion hole cutting device, when cutting the diameter expansion hole in the hole wall, the hole wall cutting blade moves in the guide groove. As this movement progresses, the hole wall cutting blade projects to the outside of the guide head to form the enlarged diameter hole portion.

Noboru 2564100 publication

In the above-mentioned diameter expansion hole cutting device, dust is generated during cutting of the hole wall cutting blade. This dust not only deteriorates the working environment, but if it gets between the parts, the expansion hole drilling device will not work properly, and the parts will wear, and the performance of the expansion hole drilling device will deteriorate. May occur.

The present invention has been made to solve such a problem, and for example, as a measure to prevent dust emission and a measure to reduce exposure to dust, it is possible to reduce the diameter of the enlarged diameter hole portion that can efficiently remove dust. The purpose is to provide a device.

A diameter-expanded hole cutting device according to an aspect of the present invention is a diameter-expanded hole part cutting device for cutting a diameter-expanded hole part in a hole formed in a workpiece, and a shaft part, A tip end surface provided on the side opposite to the shaft portion side, and a guide body provided with an inclined surface inclined from the shaft portion side toward the tip end surface side in a direction away from the central axis of the shaft portion. A bow jaw having and a cutter blade having a cutting portion provided at a tip and having a cutting portion slidable along the inclined surface, and the bow jaw having a flow passage in which a suction port opens to the tip surface. It further has a suction passage including.

According to this configuration, since the tip end face is inserted into the inner side of the hole during the cutting of the enlarged diameter hole portion, the dust generated by the cutting is efficiently sucked from the suction port of the tip end face, Can be removed from.

In the enlarged-diameter hole shaving device, the guide body has a pair of the inclined surfaces sandwiching the central axis, and a concave portion that is open to an outer peripheral surface between the pair of inclined surfaces and the tip surface. And may have.

According to this configuration, since the dust enters the concave portion through the opening of the outer peripheral surface, it is possible to prevent the dust from being fitted between the components of the diameter-expanded hole portion shaving device, deteriorating the operating performance, and wearing the components. it can. Further, since the dust that has entered the recess is guided to the opening of the tip surface by the recess and is sucked from the suction port of the tip surface, the dust can be efficiently sucked and removed.

In the enlarged diameter hole cutting device, the suction passage may include a first branch passage that branches from the flow passage and communicates with the recess.

According to this configuration, the dust that has entered the recess can be sucked from the suction port of the first branch passage and efficiently removed.

In the expanded diameter hole cutting device, the guide body may have a first groove portion that is connected to the opening of the recess provided in the tip surface and the suction port.

According to this configuration, the dust that has entered the concave portion is guided from the opening of the concave portion on the tip surface to the suction port by the first groove portion and is sucked from the suction port, so that the dust can be efficiently sucked and removed. You can

In the expanded diameter hole cutting device, the suction passage may include a second branch passage that branches from the flow passage and opens to the inclined surface.

According to this configuration, the dust on the inclined surface can be sucked from the suction port of the second branch passage and efficiently removed.

The expanded diameter hole cutting device may have a second groove portion that is open to the inclined surface and that is connected to the suction port on the tip surface.

According to this structure, the dust on the inclined surface is guided to the suction port by the second groove portion, so that the dust can be efficiently sucked and removed.

The present invention has an effect that it is possible to provide a diameter-expanded hole portion cutting device having the configuration described above and capable of efficiently removing dust.

The above objects, other objects, features, and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments with reference to the accompanying drawings.

FIG. 1A is a view of the enlarged diameter hole cutting device according to the embodiment of the present invention as viewed from the recess side. FIG. 1B is a partial cross-sectional view showing a part of the expanded diameter hole cutting device of FIG. FIG. 2A is a view of the enlarged diameter hole cutting device of FIG. 1A viewed from the inclined surface side. FIG. 2B is a partial cross-sectional view showing a part of the expanded diameter hole cutting device of FIG. 2A. FIG. 3A is a diagram of the shank viewed from the side. FIG.3 (b) is sectional drawing of a shank. FIG. 4A is a view of the cutter blade viewed from the side. FIG.4 (b) is the figure which looked the cutting part of the cutter blade from the front end side. FIG. 5A is a view of the bow jaw viewed from the recess side. FIG. 5B is a view of the bow jaw of FIG. 5A viewed from the inclined surface side. FIG. 5C is a view of the bow jaw of FIG. 5A viewed from the tip side. FIG. 6A is a sectional view of the stopper sleeve cut in a direction orthogonal to the axial direction. FIG.6 (b) is sectional drawing of a pin. FIG. 7A is a view of the bow jaw of the diameter-expanded hole shaving device according to the first modification of the embodiment of the present invention as viewed from the recess side. FIG. 7B is a view of the bow jaw of FIG. 7A viewed from the inclined surface side. FIG.7 (c) is the figure which looked at the bow jaw of FIG.7 (a) from the front end side. Fig.8 (a) is the figure which looked at the bow jaw of the diameter expansion hole part cutting device which concerns on the modification 2 of embodiment of this invention from the recessed part side. FIG. 8B is a view of the bow jaw of FIG. 8A viewed from the inclined surface side. FIG. 8C is a view of the bow jaw of FIG. 8A viewed from the tip end side. FIG. 9 (a) is a view of the bow jaw of the diameter-expanded hole cutting device according to the modified example 3 of the embodiment of the present invention as viewed from the recess side. FIG. 9B is a view of the bow jaw of FIG. 9A viewed from the inclined surface side. FIG. 9C is a diagram of the bow jaw of FIG. 9A viewed from the tip side.

(Embodiment)
<Structure of diameter expansion hole cutting device>
As shown in FIGS. 1 (a) and 2 (b), the diameter-expanded hole portion cutting device 10 according to the embodiment of the present invention has holes already formed in the workpiece B (pre-formed holes H). ) Is a shaving device for forming the enlarged diameter hole portion E.

The expanded diameter hole cutting device 10 includes a shank 20, a cutter blade 30, and a bow jaw 40. The cutter blade 30 is connected to the shank 20, and the bow jaw 40 is inserted into a hole provided inside each of the shank 20 and the cutter blade 30. Further, the shank 20 and the bow jaw 40 are fixed by a stopper sleeve 50, and a suction adapter 60 is attached to the shank 20.

The central axis G of the enlarged diameter hole cutting device 10 is also the central axis of each of the shank 20, the cutter blade 30, and the bow jaw 40, and is equal to the axis of rotation around which these rotate. Further, the side of the cutter blade 30 with respect to the shank 20 is referred to as a tip side, and the opposite side thereof is referred to as a base side. However, the arrangement of the enlarged diameter hole cutting device 10 is not limited to this.

<Structure of each part>
As shown in FIGS. 3A and 3B, the shank 20 has a mounting portion 21 and an exterior portion 22. The mounting portion 21 has a shape such as a prism and a cylinder, is provided on the proximal end side of the exterior portion 22, and is formed integrally with the exterior portion 22 coaxially with the exterior portion 22.

The exterior part 22 has a columnar shape and has a first insertion hole 23, a communication hole 24, and an elongated hole 25. The first insertion hole 23 has a cylindrical shape, extends in the axial direction inside the exterior portion 22, opens on the distal end side of the exterior portion 22, and is closed on the proximal end side.

The communication hole 24 penetrates the exterior part 22 from the first insertion hole 23 to one side in the direction orthogonal to the axial direction, and is provided on the tip side of the elongated hole 25, for example. For example, the long hole 25 penetrates the exterior portion 22 on both sides from the first insertion hole 23 in the direction orthogonal to the axial direction, and extends in the axial direction.

Also, a first cylindrical groove 26 is provided on the outer peripheral surface of the exterior part 22. The first cylindrical groove 26 is a groove into which the O-ring 70 (FIG. 1A) is mounted, and is arranged between the communication hole 24 and the elongated hole 25 in the axial direction. The first cylindrical groove 26 extends annularly around the central axis of the exterior portion 22, is recessed from the outer peripheral surface of the exterior portion 22, and opens on the outer peripheral surface of the exterior portion 22.

Furthermore, a locking part is provided at the tip of the exterior part 22. The locking portion is composed of, for example, a pair of cutout portions 27, and the pair of cutout portions 27 are arranged so as to sandwich the first insertion hole 23 therebetween in a direction orthogonal to the axial direction. There is. The cutout portion 27 is recessed from the tip of the exterior portion 22 to the base end side.

As shown in FIGS. 4A and 4B, the cutter blade 30 has a connecting portion 31 and a pair of cutting portions 32. The cutter blade 30 may have one or three or more cutting parts 32.

The connecting portion 31 has a cylindrical shape, has a second insertion hole 33 that penetrates in the axial direction, and has a locked portion at the base end. The locked portion includes, for example, a pair of protrusions 34, and the protrusion 34 projects from the base end of the connecting portion 31.

The pair of cutting parts 32 are arranged in parallel so as to sandwich the axis of the connecting part 31 between them, and are arranged so that the inner surfaces thereof face each other. The cutting portion 32 has a plate shape and projects in the axial direction from the tip of the connecting portion 31.

The cutting part 32 is curved in the circumferential direction around the axis of the connecting part 31, and the inner surface is formed by a curved surface. The cutting portion 32 has flexibility in a direction orthogonal to the inner surface, and the pair of cutting portions 32 can bend so that the distance between them can be changed.

A blade portion 35 is provided at the tip of the cutting portion 32. The blade portion 35 has a tip shape and is arranged at the center of the cutting portion 32 in the circumferential direction. The blade portion 35 projects from each of the outer surface of the cutting portion 32 opposite to the inner surface and the edge surface of the tip.

As shown in FIGS. 5A to 5C, the bow jaw 40 has a shaft portion 41 and a guide body 42, and a suction passage 80 is provided inside. The shaft portion 41 is a columnar rod-shaped body, and the guide body 42 is substantially columnar. The shaft portion 41 is arranged closer to the base end side than the guide body 42 and is formed coaxially and integrally with the guide body 42.

The shaft portion 41 has a first outer peripheral surface and a first pin hole 43. The first outer peripheral surface surrounds the central axis between the tip end and the base end of the shaft portion 41. The first pin hole 43 is arranged closer to the base end side than the suction passage 80, and penetrates the shaft portion 41 in a direction orthogonal to the axial direction.

The guide body 42 has its base end connected to the shaft portion 41, and has a tip surface 44 at its tip. Further, the guide body 42 has a second outer peripheral surface that surrounds the central axis between the distal end and the base end, and the second outer peripheral surface is provided with a pair of inclined surfaces 45 and a pair of recesses 46.

The pair of inclined surfaces 45 is provided on the bow jaw 40, but one or three or more inclined surfaces 45 may be provided on the bow jaw 40. In this case, the cutter blade 30 is provided with the same number of cutting portions 32 as the number of the inclined surfaces 45. Further, although the pair of recesses 46 is provided in the bow jaw 40, one or three or more recesses 46 may be provided in the bow jaw 40.

The inclined surface 45 is a surface on which the cutting portion 32 of the cutter blade 30 slides, and is formed, for example, as a flat surface. As shown in FIG. 4B, at the position where the cutting portion 32 faces the inclined surface 45, the inner surface of the cutting portion 32 is curved so as to project from the inclined surface 45. Therefore, the gap 48 is formed between the inclined surface 45 and the cutting portion 32.

As shown in FIGS. 5A to 5C, the inclined surface 45 is arranged between the pair of protrusions 47 in the direction orthogonal to the axial direction and extends in the axial direction. The pair of protrusions 47 project from the inclined surface 45 and extend along the inclined surface 45 in the axial direction.

The inclined surface 45 is inclined from the shaft portion 41 side toward the tip surface 44 side in a direction away from the central axis of the shaft portion 41. Due to this inclined surface 45, the diameter of the guide body 42 increases as it goes from the base end side to the tip end side. Further, the pair of inclined surfaces 45 are arranged so as to sandwich the shaft therebetween, and the distance between the pair of inclined surfaces 45 becomes wider from the proximal end side toward the distal end side.

The recess 46 is disposed between the pair of inclined surfaces 45 in the circumferential direction, and opens on the second outer peripheral surface of the guide body 42 and the tip surface 44. Therefore, the recess 46 is recessed from the first opening 46a of the second outer peripheral surface in the direction orthogonal to the axial direction and recessed from the second opening 46b of the tip end surface 44 in the axial direction. The pair of recesses 46 are arranged so as to sandwich the shaft therebetween, and the suction passage 80 is disposed between the pair of recesses 46.

The suction passage 80 has a flow passage 81, a pair of first branch passages 82, and a pair of second branch passages 83. The suction passage 80 may have one first branch passage 82 or one second branch passage 83. Further, the suction passage 80 may have three or more first branch passages 82 or three or more second branch passages 83 depending on the number of the inclined surfaces 45 and the concave portions 46. Good.

For example, the flow passage 81 branches into a first branch 82 and a second branch 83. Therefore, the suction port of the suction passage 80 has the first suction port 81a of the flow passage 81, the second suction port 82a of the first branch passage 82, and the third suction port 83a of the second branch passage 83.

For example, the flow passage 81, the first branch passage 82, and the second branch passage 83 have the same diameter. The area of the discharge port 84 of the suction passage 80 is set to be equal to or more than the total sum of the areas of the first suction port 81a, the second suction port 82a, and the second suction port 82a.

The flow passage 81 extends from the first suction port 81a through the guide body 42 to the shaft portion 41 in the axial direction, and is provided coaxially with the guide body 42 and the shaft portion 41. The first suction port 81 a of the flow passage 81 opens at the center of the tip end surface 44 of the guide body 42. The discharge port 84 of the flow passage 81 opens to the first outer peripheral surface of the shaft portion 41 and extends longer in the axial direction than in the radial direction.

The first branch passage 82 communicates the flow passage 81 with the recess 46 of the guide body 42. For example, the first branch passage 82 branches from the flow passage 81, extends in a direction intersecting (for example, orthogonal to) the axial direction, and opens at the bottom of the recess 46. The second suction port 82a of the first branch passage 82 is disposed, for example, on the tip side with respect to the center of the recess 46 in the axial direction.

The pair of first branch paths 82 are connected to each other through the flow path 81 and are arranged so as to extend in a straight line. In this case, the pair of first branch passages 82 can be formed at the same time by forming a straight line between the pair of recesses 46, and the pair of first branch passages 82 can be easily manufactured.

The second branch passage 83 connects the flow passage 81 with the gap portion 48 (FIG. 4B) between the cutting portion 32 and the inclined surface 45 at a position where the cutting portion 32 faces the inclined surface 45. For example, the second branch passage 83 branches from the flow passage 81, extends in a direction intersecting (for example, orthogonal to) the axial direction, and opens to the inclined surface 45.

The pair of second branch passages 83 are connected to each other through the flow passage 81 and arranged so as to extend in a straight line. In this case, the pair of second branch passages 83 can be simultaneously formed by punching a straight line between the pair of inclined surfaces 45, and the pair of second branch passages 83 can be easily manufactured.

Further, the first branch 82 and the second branch 83 are provided at the same position in the axial direction. Therefore, they are arranged so as to intersect (for example, orthogonally) with each other. In addition, the first branch path 82 and the second branch path 83 may be displaced from each other in the axial direction, and the pair of first branch paths 82 and the pair of second branch paths 83 are displaced from each other. May be arranged.

▽ The tip surface 44 extends in the direction orthogonal to the axial direction, and the central portion thereof projects. The central portion is a flat surface, and the distal end surface 44 is inclined toward the base end side as it goes from the central portion to the outer peripheral edge.

The front end surface 44 is provided with a first suction port 81a of the flow passage 81, a second opening 46b of the pair of recesses 46, a pair of first groove portions 90 and a pair of second groove portions 91. It should be noted that the tip surface 44 may be provided with one first groove 90. Further, the tip surface 44 may be provided with one second groove portion 91.

The first suction port 81a is arranged at the center of the tip surface 44, and the pair of second openings 46b are arranged so as to sandwich the first suction port 81a between them. Therefore, the first suction port 81a and the pair of second openings 46b are provided side by side on the straight line on the distal end surface 44.

The first groove 90 is recessed from the tip end surface 44, extends in the direction orthogonal to the axial direction, and is connected to the second opening 46b of the recess 46 and the first suction port 81a. One end of each of the pair of first groove portions 90 is connected to each other and the other end thereof is connected to each of the pair of second openings 46b, and they are arranged in a straight line.

The second groove portion 91 is recessed from the tip surface 44 and extends so as to intersect (for example, orthogonally) the first groove portion 90 so as to be connected to the first suction port 81a. For example, the second groove portion 91 extends from the first suction port 81a to the inclined surface 45 and opens in the inclined surface 45 as a groove opening 91a.

The depth of the second groove portion 91 from the tip surface 44 is such that the bottom of the second groove portion 91 is located on the tip side of the cutting portion 32 when the cutting portion 32 slides on the inclined surface 45 to the most tip side. Is set to. Therefore, even if the cutting portion 32 slides on the inclined surface 45, the cutting portion 32 is located closer to the base end side than the second groove portion 91, so that the groove opening 91 a of the second groove portion 91 is closed by the cutting portion 32. I can't.

Further, when the cutting portion 32 slides and faces the inclined surface 45, the gap portion 48 formed between them is arranged in the vicinity of the groove opening 91 a of the second groove portion 91.

As shown in FIGS. 1 (a), 2 (a) and 6 (a), the stopper sleeve 50 has a cylindrical shape and has a mounting hole 51, a second pin hole 52 and a first fixing hole 53. is doing. The mounting hole 51 penetrates the stopper sleeve 50 in the axial direction of the stopper sleeve 50. The diameter of the mounting hole 51 is set larger than the outer diameter of the shank 20 so that the shank 20 can be inserted into the mounting hole 51.

The second pin hole 52 is a hole into which the pin 71 is inserted, extends from the mounting hole 51 in a direction orthogonal to the axial direction, and penetrates the stopper sleeve 50. The first fixing hole 53 is a hole into which a screw for fixing the pin 71 to the stopper sleeve 50 is inserted, extends in the direction orthogonal to the axial direction, and intersects with the second pin hole 52 (for example, the orthogonal direction). )is doing.

As shown in FIGS. 1A and 2A, the suction adapter 60 has an annular portion 61 and a pipe portion 62. The annular portion 61 has a cylindrical shape and has a stepped hole 63 and a second cylindrical groove 64. The stepped hole 63 penetrates the annular portion 61 in the axial direction thereof and has a large diameter portion 65 having a large diameter. The diameter of the large diameter portion 65 is larger than the outer diameter of the shank 20, and the diameter of the stepped hole 63 other than the large diameter portion 65 is substantially equal to the outer diameter of the shank 20.

The second cylindrical groove 64 is a groove into which the O-ring 70 is mounted, opens on the inner surface of the annular portion 61, and is arranged closer to the base end side than the large diameter portion 65. The pipe portion 62 is coupled to the annular portion 61 so as to communicate with the stepped hole 63 of the annular portion 61.

<Assembly of expansion hole drilling device>
As shown in FIGS. 1A and 2A, the protrusion 34 of the cutter blade 30 is fitted into the cutout portion 27 of the shank 20. As a result, the projection 34 is locked in the notch 27, and the base end of the cutter blade 30 and the tip of the shank 20 are connected. The cutter blade 30 and the shank 20 are arranged coaxially, and the second insertion hole 33 of the cutter blade 30 and the first insertion hole 23 of the shank 20 communicate with each other.

Subsequently, the spring 73 is inserted into the first insertion hole 23, and then the shaft portion 41 of the bow jaw 40 is inserted into the first insertion hole 23 and the second insertion hole 33. As a result, the spring 73 is arranged between the base end of the shaft portion 41 and the base end of the first insertion hole 23.

Next, insert the shank 20 into the mounting hole 51 of the stopper sleeve 50. Here, in the direction orthogonal to the axial direction, the stopper sleeve 50 and the shank 20 are arranged so that the second pin hole 52 of the stopper sleeve 50, the elongated hole 25 of the shank 20, and the first pin hole 43 of the bow jaw 40 overlap each other. And the bow jaw 40 is arrange | positioned.

Then, the pin 71 is inserted into the second pin hole 52, the long hole 25, and the first pin hole 43. Then, the screw is inserted into the second fixing hole 72 of the pin 71 and the first fixing hole 53 of the stopper sleeve 50 and screwed. As a result, the pin 71 is fixed to the stopper sleeve 50.

The pin 71 has almost the same size as the first pin hole 43 and the second pin hole 52 in the axial direction, while the elongated hole 25 has a size larger than that of the pin 71, the first pin hole 43, and the second pin hole 52. long. Therefore, the pin 71 is fixed to the first pin hole 43 and the second pin hole 52, but is movable in the axial direction with respect to the elongated hole 25.

Therefore, the shank 20, the cutter blade 30, and the bow jaw 40 relatively move in the axial direction, so that the enlarged diameter hole cutting device 10 can expand and contract. The spring 73 biases the cutter blade 30 toward the base end side as the diameter expansion hole cutting device 10 contracts and the cutter blade 30 moves toward the tip end side with respect to the bow jaw 40.

Also, insert the shank 20 into the stepped hole 63 of the suction adapter 60 and attach the suction adapter 60 to the shank 20. As a result, the inner surface of the annular portion 61 and the outer surface of the shank 20 face each other, and the large diameter portion 65 forms a communication path 66 therebetween. The connecting path 66 is formed in an annular shape so as to surround the shank 20.

At this time, the large diameter portion 65 of the stepped hole 63, the communication hole 24 of the shank 20, and the discharge port 84 of the suction passage 80 are arranged so as to overlap in the direction orthogonal to the axial direction. As a result, the suction passage 80 communicates with the annular communication passage 66 via the communication hole 24. Further, the O-ring 70 fitted in the first cylindrical groove 26 and the second cylindrical groove 64 prevents the shank 20 from coming off so that the shank 20 can rotate with respect to the suction adapter 60.

<Operation of diameter expansion hole cutting device>
The diameter-expanded hole portion cutting device 10 forms the diameter-expanded hole portion E in the existing hole H of the workpiece B. The preformed hole H is a hole formed in a work B such as a concrete wall by a drilling machine such as a drill, and is, for example, a bottomed cylindrical hole.

-Connect a rotary electric motor to the mounting part 21 of the shank 20 to operate it. As a result, the shank 20, and the cutter blade 30 and the bow jaw 40 connected thereto rotate. Further, a suction device is connected to the pipe portion 62 of the suction adapter 60 to operate. At this time, since the shank 20 and the suction adapter 60 are not fixed, the shank 20 rotates but the suction adapter 60 does not rotate.

Also, the expanded diameter hole cutting device 10 is inserted into the existing hole H. At this time, since the cutter blade 30 is biased toward the proximal end side of the bow jaw 40 by the spring 73, the cutting portion 32 of the cutter blade 30 is located at the proximal end side of the inclined surface 45 of the bow jaw 40. Thereby, the distance between the pair of cutting portions 32 is smaller than the opening diameter of the preformed hole H, and the cutter blade 30 and the bow jaw 40 can be inserted into the preformed hole H.

Then, push the cutter blade 30 toward the tip side with respect to the bow jaw 40. As a result, the cutting portion 32 of the cutter blade 30 moves to the tip side on the inclined surface 45 of the bow jaw 40. At this time, the cutting portion 32 slides between the pair of projecting portions 47 along them and is guided in the axial direction by the pair of projecting portions 47.

The cutting part 32 bends along the inclined surface 45, and the distance between the pair of cutting parts 32 increases. Further, along with this, as the cutting portion 32 rotates, the blade portion 35 of the cutting portion 32 hits and cuts the inner surface of the preformed hole H, so that the enlarged hole portion E is formed in the preformed hole H. At this time, dust is generated by cutting the machinable object.

The dust enters the recess 46 adjacent to the blade 35 in the rotation direction, and is sucked into the first branch passage 82 from the second suction port 82a opening in the recess 46. Further, the dust that has not been sucked from the second suction port 82a in the concave portion 46 descends in the concave portion 46 due to its own weight to reach the second opening 46b, passes through the first groove portion 90 connected to the second opening 46b, and is first sucked. It is guided to the mouth 81a and sucked into the flow passage 81 from the first suction port 81a.

Further, the dust falls from the blade portion 35 or enters the gap portion 48 between the cutting portion 32 and the inclined surface 45. These dusts descend and are sucked into the second branch passage 83 from the third suction port 83a below the blade portion 35 and the gap portion 48. Further, the dust not sucked from the third suction port 83a descends along the inclined surface 45 to reach the groove opening 91a, is guided from the groove opening 91a to the first suction port 81a through the second groove portion 91, It is sucked into the flow passage 81 from the first suction port 81a.

In this way, in the guide body 42, the second suction port 82a and the third suction port 83a are arranged closer to the blade portion 35 side than the first suction port 81a, so that the dust generated by the cutting of the blade portion 35 can be discharged more quickly. Can be sucked into. Further, the first suction port 81a is disposed below the second suction port 82a and the third suction port 83a, so that the dust that has not been sucked by the second suction port 82a and the third suction port 83a is lowered. Can be aspirated. Further, the first groove portion 90 guides the dust in the concave portion 46 to the first suction port 81a, and the second groove portion 91 guides the dust in the inclined surface 45 and the gap portion 48 to the first suction port 81a, so that the dust is further removed. It can be sucked efficiently.

Thus, the dust sucked from each suction port passes through the suction passage 80, the discharge port 84 through the communication hole 24 and the communication passage 66, and is collected from the pipe portion 62 to the suction device.

Therefore, a plurality of dusts generated during the grinding work are sucked from the suction port, and are guided by the recess 46 and each groove to be sucked from the first suction port 81a. Therefore, it is possible to reduce a lock in which the dust is fitted between the members of the enlarged diameter hole cutting device 10 and the rotation is stopped, and the cutting work can be smoothly performed.

Moreover, since it is not necessary to provide the expanding hole forming device 10 with a mechanism for releasing the lock, the expanding hole forming device 10 can be simplified and the cost can be reduced. Further, since the dust that scatters to the outside during the cutting work can be reduced, it is possible to reduce the exposure of the worker to the dust and improve the working environment.

Furthermore, since the first suction port 81a faces the bottom of the existing hole H, it is possible to suck the dust that has fallen to the bottom. Therefore, at the end of shaving, little dust remains in the existing holes H and the enlarged diameter hole portions E, and this cleaning can be easily or omitted.

Then, by forming the expanded hole portion E in the existing hole H, for example, a bolt hole is formed in the workpiece B. By inserting an anchor bolt into this bolt hole and enlarging the head portion, the enlarged head portion is locked in the diameter-expanded hole portion E, and the anchor bolt has increased pull-out strength.

<Modification 1>
In the bow jaw 140 of the enlarged diameter hole cutting device 10 according to the first modification, as shown in FIGS. 7A to 7C, the guide body 42 may not have the second groove portion 91. .. The configuration other than this is the same as the configuration of the expanded diameter hole portion cutting device 10 of FIG. Therefore, the guide body 42 has the concave portion 46 and the first groove portion 90, and the suction passage 80 has the flow passage 81, the first branch passage 82, and the second branch passage 83. The forming apparatus 10 can efficiently remove dust.

Note that, in the enlarged diameter hole cutting device 10 according to the first modification, the suction passage 80 may not have at least one of the first branch passage 82 and the second branch passage 83. Even in this case, the dust can be efficiently removed by the flow passage 81.

<Modification 2>
In the bow jaw 240 of the enlarged diameter hole cutting device 10 according to the second modification, as shown in FIGS. 8A to 8C, the guide body 42 has a first groove portion 90 and a second groove portion 91. You don't have to. The configuration other than this is the same as the configuration of the expanded diameter hole portion cutting device 10 of FIG. Therefore, the guide body 42 has the concave portion 46, and the suction passage 80 has the flow passage 81, the first branch passage 82, and the second branch passage 83. Dust can be removed efficiently.

<Modification 3>
In the bow jaw 340 of the enlarged diameter hole cutting device 10 according to Modification 3, as shown in FIGS. 9A to 9C, the guide body 42 has the first groove portion 90 and the second groove portion 91. Alternatively, the suction passage 80 may not have the second branch passage 83. The configuration other than this is the same as the configuration of the expanded diameter hole portion cutting device 10 of FIG. Therefore, the guide body 42 has the concave portion 46, and the suction passage 80 has the flow passage 81 and the first branch passage 82, so that the diameter expansion hole shaving device 10 efficiently removes dust. can do.

Note that, in the enlarged diameter hole cutting device 10 according to Modification 3, the suction passage 80 may not have the first branch passage 82 but may have the second branch passage 83. Alternatively, in the enlarged diameter hole cutting device 10 according to Modification 3, the suction passage 80 does not have to have the first branch passage 82 and the second branch passage 83. Even in these cases, the dust can be efficiently removed by the flow passage 81.

<Other modifications>
In the bow jaw 140 of the enlarged diameter hole cutting device 10 according to another modification, the guide body 42 may have the second groove portion 91 instead of the first groove portion 90. In this case, the suction passage 80 may have the first branch passage 82 and the second branch passage 83, or may not have at least one of the first branch passage 82 and the second branch passage 83. Good. Even in this case, dust can be efficiently removed by the flow passage 81.

In the bow jaw 140 of the expanded hole portion cutting device 10 according to still another modification, the guide body 42 has the first groove portion 90 and the second groove portion 91, and the suction passage 80 has the first branch passage 82 and the first branch passage 82. It is not necessary to have at least one of the two branched paths 83. Even in this case, the dust can be efficiently removed by the flow passage 81.

The guide body 42 does not need to have the recessed portion 46 in all of the enlarged diameter hole cutting devices 10 described above. Even in this case, the dust can be efficiently removed by the flow passage 81.

In all of the diameter-expanded hole cutting devices 10 described above, even if the corner between the tip surface 44 and the first groove portion 90 and the corner between the tip surface 44 and the second groove portion 91 are chamfered. Good.

In all of the enlarged diameter hole cutting devices 10 described above, the diameters of the flow passage 81, the first branch passage 82 and the second branch passage 83, and the cross-sectional areas of the first groove portion 90 and the second groove portion 91 are adjusted. Thereby, the ratio of the suction force from the first suction port 81a, the second suction port 82a, and the third suction port 83a can be controlled.

The expanded diameter hole cutting device of the present invention is useful as a expanded diameter hole cutting device that can efficiently remove dust.

10: Expanding hole part cutting device 30: Cutter blade 32: Cutting part 35: Blade part 40: Bow jaw 41: Shaft part 42: Guide body 44: Tip surface 45: Inclined surface 46: Recess 80: Suction passage 81: Distribution Path 81a: First suction port (suction port)
82: 1st branch path 83: 2nd branch path 90: 1st groove part 91: 2nd groove part 140: Bow jaw 240: Bow jaw 340: Bow jaw

Claims

A diameter-expansion hole portion cutting device for forming a diameter-expansion hole portion in a hole formed in a workpiece,
A shaft portion, a tip surface provided on the side opposite to the shaft portion side, and an inclined surface inclined from the shaft portion side toward the tip surface side in a direction away from the central axis of the shaft portion are provided. A bow jaw having a guide body,
A blade portion is provided at the tip, and a cutter blade having a cutting portion slidable along the inclined surface is provided,
The bow jaw according to claim 1, further comprising a suction passage including a flow passage having a suction port opening to the tip end surface.
The guide body is
A pair of the inclined surfaces provided so as to sandwich the central axis,
The diameter-expanding hole part cutting device according to claim 1, further comprising: an outer peripheral surface between a pair of the inclined surfaces and a recessed part that is open to the tip end surface.
The expansion hole portion cutting device according to claim 2, wherein the suction passage includes a first branch passage that branches from the flow passage and communicates with the recess.
The diameter expansion hole shaving device according to claim 2 or 3, wherein the guide body has a first groove portion that is connected to the opening of the recess provided on the tip surface and the suction port. ..
The diameter expansion hole ablation device according to any one of claims 1 to 4, wherein the suction passage includes a second branch passage branched from the flow passage and opening to the inclined surface.
The diameter expansion according to any one of claims 1 to 5, wherein the guide body has a second groove portion that is open to the inclined surface and that is connected to the suction port on the tip end surface. Hole cutting equipment.